MacsBug offers many commands for disassembling, searching, and viewing data as well as control over processor registers.

When Apple introduced the Power Macintosh in 1994, it was followed by an updated MacsBug that supported the PowerPC instruction set and architecture.

This final version works with all of the machines released in the July–September timeframe of 2000, including the Power Mac G4 (uni- and multi-processor), Power Mac G4 Cube, the iMac family (Ruby, Indigo, Sage, Graphite, and Snow), and the iBook family (Indigo, Key Lime, and Graphite).

6.6.3 includes better support for debugging MP tasks, and fixes some serious bugs in the memory setting commands when used in PCI I/O space.

Third party alternatives to MacsBug included ICOM Simulations' TMON which came with the Darin Adler Extended User Area & Trap Discipline (allowing all documented Mac API parameters to be verified) and the fully symbolic Jasik debugger, which was much more powerful, but harder to use due to the intricate and non-standard user interface.